As part of an effort to curb damage from account theft, Neverwinter bags are being made bind-on-equip. The update took place during today’s maintenance and includes the greater elven silken bag, bag of holding, and greater bag of holding.
The update also adds a runic bag of holding:
Over the course of our game, we have added more potions, refinements and additional items that you will find on our adventures through Faerûn. However, we haven’t made efforts to increase the inventory space. The Runic Bag of Holding will add that additional space for those players looking to bring along more loot as they explore the world.
Bags already equipped will not be bound until they are equipped again.